Adapting to noisy 3-D data: Enhancing Algerian giant field development through strategic planning of 3-D seismic in Berkine Basin

Drummond, Jock; Ryan, Jim; Kasmi, Rashid

doi:10.1190/1.1487283

Cited by 9 publications

(8 citation statements)

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“…However, the dominant effect appears to be associated with the shot-line interval and not so much with the full-swath roll design. Drummond et al (2001) conclude that parallel geometry with better stack response would be more suited in the area than a cross-spread geometry. In an area with moderate geologic complexity, parallel geometry should be as suitable as orthogonal geometry; but it tends to be more expensive, often leading to shortcuts such as large crossline bin size.…”

Section: Full-swath Rollmentioning

confidence: 91%

“…Schroeder et al (1998) use the data of a parallel geometry acquired on land to study the effect of fold and bin size on quality. Drummond et al (2001) were so disappointed about the results of their orthogonal geometry survey in the Algerian desert that they decided to use parallel geometry from that point on (Section 4.5.2.3).…”

Section: Parallel Geometry Versus Orthogonal Geometrymentioning

confidence: 97%

“…Drummond et al (2001) use modeling to establish that a regular offset distribution in the bins is best for noise suppression; hence, they conclude that parallel geometry is called for. The power of prestack noise analysis in orthogonal geometry is not investigated.…”

Section: Model-based Survey Designmentioning

confidence: 98%

“…It is used mainly for marine data acquisition, using multisource multistreamer (MS/MS) configurations, but it is also used on land (e.g., Dickinson et al, 1990), particularly in Algeria (Drummond et al, 2001). Modern marine MS/MS configurations use one or two sources located in the middle of a wide arrangement of up to 18 or even more streamers.…”

Section: Examples Of Various Geometriesmentioning

confidence: 99%

“…This was accomplished by shooting a one-line roll template consisting of eight receiver lines onshore; in the transition zone and offshore, a full-swath roll (actually two, first with eight receiver lines and then with four receiver lines) was acquired with sufficient shots outside the swath for complete recovery of the nominal geometry. Figure 4.21 describes the parameters of a full-swath roll geometry used in Algeria (detailed analysis in Drummond et al, 2001). The length of the shot line is exactly twice the crossline roll.…”

Section: Full-swath Rollmentioning

confidence: 99%

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3D Seismic Survey Design, Second edition

Vermeer¹

2012

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Section: Full-swath Rollmentioning

confidence: 91%

Section: Parallel Geometry Versus Orthogonal Geometrymentioning

confidence: 97%

Section: Model-based Survey Designmentioning

confidence: 98%

Section: Examples Of Various Geometriesmentioning

confidence: 99%

Section: Full-swath Rollmentioning

confidence: 99%

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3D Seismic Survey Design, Second edition

Vermeer¹

2012

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Locating Exploration and Appraisal Wells Using Predictive Rock Physics, Seismic Inversion and Advanced Body Tracking: an Example from North Africa

Pickering¹,

Knight

Bletcher³

et al. 2004

Memoirs

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A case study is described that illustrates a complete reservoir property prediction workflow, from petrophysical analysis, through rock physics, impedance inversion, and on to interpretation and final drilling locations. This study is from onshore Algeria, where the hydrocarbons are found in several clastic reservoirs of varying ages and properties. The controls on the presence of both reservoir and hydrocarbon location are not straightforward, therefore reducing the risk of drilling locations has significant value. This study concentrated on the Triassic TAG-I formation, which forms the major reservoir in the study area. The prediction method used was an impedance based deterministic approach, using relationships based on rock physics, although the interpretation method includes fuzzy set classifications to take into account the "non-uniqueness" inherent in any seismic attribute. The petrophysical work ensured that the analysis of each well reconstructed 'virgin-zone" conditions. Rock physics models were then used to predict shear wave velocities. Acoustic impedance (AI), shear impedance (SI), and elastic impedance (EI) profiles were derived. Shear impedance was the best pure lithology indicator, with acoustic impedance showing a good relationship to porosity and elastic impedance most sensitive to fluid content. As the near angle seismic data were too noisy, gradient/intercept analysis was impossible, so shear reflectivity and consequently SI could not be derived. Although AI showed some lithological discrimination between sands and shales, it was not sufficient to be used as a single discriminator, so interpreted horizons were used to separate reservoir and non-reservoir intervals. The far-angle data were inverted to EI and this was analysed using a fuzzy logic approach. This method produces a classification volume and 3D body tracking was then used to find the best drilling targets. Generally, the analysis correctly predicted the results of the wells. both discoveries and non-discoveries. However, some of the discoveries were not predicted, which appears to be where the classification was not correctly calibrated. Work is now underway to improve the accuracy of the prediction process.DAVIES, R.

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Improving structural and stratigraphic interpretation using borehole‐integrated seismic processing — Ledjmet block, Algeria

Walia¹,

Brandt²,

Whittaker³

et al. 2004

SEG Technical Program Expanded Abstracts 2004

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Fig.1 Berkine Basin Oil and Gas Trend-more than 5 Billion Barrels of oil discovered to date. First Calgary Petroleums Ltd. (FCP) along with its partner Sonatrach (National oil company of Algeria) has drilled several successful exploration wells in the Ledjmet Block 405b of the Berkine basin, Algeria within the last two years (Fig.1). 2D data of different vintages could not provide an accurate interpretation; therefore two 3D seismic surveys (~850 sq km) using vibroseis 100-fold parallel-geometry were acquired. This acquisition geometry allowed a better sampled offset distribution (50-5000m) in the CDP domain. This also resulted in effective noise attenuation, a better velocity analysis, improved S/R (Signal-to-Noise Ratio) and a stable full Kirchhoff Pre-Stack Time Migration (KPSTM). Despite careful planning and utilizing all the knowledge available at the time, the 3D processing was faced with several challenges in terms of statics, noise (random, linear, multiples and acquisition footprint), and most of all velocity analysis. These all had an effect on the integrity of structural and stratigraphic interpretation Several processing flows were rigorously tested using specialized programs to deal with the issues discussed above, particularly

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Adapting to noisy 3-D data: Enhancing Algerian giant field development through strategic planning of 3-D seismic in Berkine Basin

Cited by 9 publications

References 0 publications

3D Seismic Survey Design, Second edition

3D Seismic Survey Design, Second edition

Locating Exploration and Appraisal Wells Using Predictive Rock Physics, Seismic Inversion and Advanced Body Tracking: an Example from North Africa

Improving structural and stratigraphic interpretation using borehole‐integrated seismic processing — Ledjmet block, Algeria

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